code: def testRecursiveHDAllReduce(self):
      self._testRecursiveHDAllReduce(1, 2, [8])
      self._testRecursiveHDAllReduce(1, 2, [4, 4])
      self._testRecursiveHDAllReduce(1, 8, [32])
      self._testRecursiveHDAllReduce(1, 8, [120])
      self._testRecursiveHDAllReduce(2, 8, [8, 8])
      self._testRecursiveHDAllReduce(4, 8, [8, 8, 2])
  
imports: import time
  import numpy
  from tensorflow.core.framework import types_pb2
  from tensorflow.python.distribute.v1 import all_reduce
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import state_ops
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 15 for calling the AllReduceTest obj's underlying member method code with example usage: obj.testRecursiveHDAllReduce() without return types